Malicious PDF — malware analysis report

Static analysis result for SHA-256 84272bcbb5bc38d9…

MALICIOUS

PDF

75.7 KB Created: 2020-11-24 10:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3390e151c87cbb0b9b01151510845c53 SHA-1: d7001590e034cc35838f27daba891545b41a2b65 SHA-256: 84272bcbb5bc38d9a962b83d881fb7c656fa79430173bcc674d425bceedf807c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/strik?utm_term=thor+jane+foster PDF link annotation
    • https://nugemezan.weebly.com/uploads/1/3/4/3/134359438/5598760.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/a37a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/222ba864-c4ec-48b7-9161-df4ff338da5d/exercicios_resolvidos_de_aguas_pluvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf431de-4a47-4767-919f-44c24cf89cfa/subterror_deck_duel_links.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f344e8-91f6-45bf-9923-d9fe0c37f375/kuwin.pdfIn PDF document text
    • https://s3.amazonaws.com/popagexexoza/tolelarunelejinate.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/48750897124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32438c1-25ab-49ee-a4ae-5b78fbba1e11/4th_step_inventory_list_of_character_defects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb775d4-5e66-44e1-94b8-b81e2a16f6f0/tivapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e15432-2a4f-413f-a5c1-a0e25cb5aa81/vermectil_6_mg_posologia_de_enteroge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d671b41f-7688-4166-b0b3-72f94dd6e3ed/chemfiesta_balancing_equations_answer_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 4848 bytes
SHA-256: 4d972050fecad79f1e5f5cdd7f12fb9d03d31dc93c554a9dbb9b2ff797a246e9
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10240 bytes
SHA-256: 5c032e5fb62f9d3f3df1be4585b452c2d59160307e258c2063455f8504b00da8

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